Apparatus for cutting cardboard and similar substances for decorations of shop windows and sceneries



Feb. 3, 1931. H MULLER 1,791,320

APPARATUS FOR CUTTING CARDBOARD AND SIIILAR SUBSTANCES FOR DECORATIONS0F SHOP WINDOWS AND SCENERIES Filed June 15, 1928 Patented Feb. 3, 1931uurrsn STATES PATENT OFFICE HERMANN Mfi'LLER, OF SIEGEN, GERMANY,ASSIGNOR TO HERMANN LEWINSOHN, F

SIEGEN, WESTPHALIA, GERMANY APPARATUS FOR CUTTING CARDBOARD AND SIMILARSUBSTANCES FOR DECORATIONS OF SHOP WENDOWS AND SCENERIES Applicationfiled June 13, 1928, Serial No. 285,094, and in Germany December 30,1927.

This invention relates to an apparatus for cutting cardboard and similarsubstances for decorations of shop-windows and sceneries, and furtherfor cutting characters, words and figures directly into the cardboard.

Hitherto this cutting has either been carried out by hand with asuitable knife or by means of an endless saw. The cutting with a knifeby hand is very fatiguing and requires much time, and on the other handan endless saw is seldom at disposal in theaters and business in whichthe decorations have to be used, and it is scarcely worth while to buyan endless saw as it has to be used only occasionally. Owing to thenecessity to transport the material to and from the workshops in whichan endless saw is at disposal, this would be too expensive and requirestoo much time. A. further inconvenience is that the saw forms on therear-side of the cut an irregular edge. It is further not possible toobtain sharp edges at the cutting of characters by means of a saw or thelike. The bodies to be cut out have sometimes to be out fromcomparatively large sheets and it is very troublesome to handle suchlarge sheets in an endless saw.

All these inconveniences are avoided by the invention, according towhich a small size machine is used for cutting decorations fromcardboard or the like. This machine is mounted on a support constructedto form a handle and on which an electromotor is mounted which in rapidsuccession drives, I through the intermedlary of a crank or eccentric, asmall knife moving in the foot, of the support and being rapidly movedup and down to cut through the material. The small size machine is movedon the cardboardsheet by hand the knife being guided along the contoursof the body to be out. In this manner it is possible to cut out any bodyrapidly and easily. As the knife, owing to its shape, carries out adrawing-cut no burrs are produced on the back of the cardboard.

An embodiment of the invention is illustrated, by way of example, in theaccompanying drawing in which Fig. l is a front-elevation of themachine.

Fig. 2 is a side-elevation.

Figs. 3, 4- and 5 show on larger scale different forms of constructionof the foot of the support for carrying out special work.

The support a of the machine has a foot 2), which has at the middle acut out portion 0 for the tool. On the support a an electromotor ismounted in a casing d. On the motor-casing a switch e for the electricwire f is arranged.

On each end of the shaft 9 of the motor an eccentric disc 2' is keyed onthe outer sides of the-bracket h, driving rods It being mounted on saideccentric discs. These driving rods serve to convert the rotatingmovement of the motor into a straight reciprocating moveinlent withoutthe use of spur-wheels or the The driving rods 74 are both hingedlyconnected to a transverse rod Z.

In the top-portion m of the support a a, slot is arranged in which thetransverse rod Z can moveup and down.

The support a is hollow and in the same a vertical rod a is locatedwhich is fixed to the transverse rod Z and carries on its lower end.

a cutting tool 0 located in the cut out portion 0 of the foot 6.

The cutting tool consists of a sharp knife which can be removed andground. When the motor is started, the knife 0 is rapidly moved up anddown. A spiral-spring p in the h0llow support a serves for equalizingthe masses so that the machine can be tilted to remove the tool rapidlyfrom the sheet of cardboard or the like.

In the foot 6 a bar It having a downwardly projecting point 1" isinserted so that it can be shifted in longitudinal direction. The point7" serves as center of a circle which has to be cut. The bar If isconnected to a rod 14 mounted in a hub v of thefoot b so that it can beshifted in horizontal direction. A screw 10 serves for securing the rod10 in its adjusted position. The point r can thus be pulled out acomparatively long distance.

I claim:

1. A machine for cutting figures from sheets of cardboard and similarmaterial for shop Window and stage decorations, comprising a verticalhollow support adapted to be gripped to guide the machine like a handtool over the materal to be cut, a foot for said support having a cutout portion at the middle, a vertically reciprocable rod guided in saidhollow support, said rod carrying a knife in its lower end, a casingmounted centrally on the upper end of said support, a motor in saidcasing, an eccentric at each end of said motor, a cross piece on the topend of said rod, and connecting rods connecting said eccentrics to saidcross piece.

A machine as specified in claim 1, comprising; in combination with saidvertical roo, a. shoulder on said rod, and a spiral spring wound aroundsaid rod reacting against said shoulder for reducing vibration.

3. A. machine as specified in claim 1, comprising in combination Withthe foot of th support, a plate shiftably mounted in said foot, acompass point in the lower surface of said plate, a hub on the rear endof said foot, a rod shiftably mounted in said hub, said plate hingedlyfixed to said rod, and means for securing said rod in its adjustedposition.

4. A machine as specified in claim 1, comprising in combination with thefoot of the support an inclined arm rearwardly projecting from said footdesigned to support the machine in a tilted position and permit slidingover the surface of the material Without stopping the motor.

In testimony whereof I affix my signature.

HERMANN MULLER.

